#include "apue.h"
#include <sys/times.h>

static void pr_times(clock_t, struct tms*, struct tms*);
static void do_cmd(char *);

int main(int argc, char *argv[])
{
    int i;

    setbuf(stdout, NULL);
    for (i = 1; i < argc; i++)
    {
        do_cmd(argv[i]);
    }
    exit(0);
}

static void do_cmd(char *cmd)
{
    struct  tms     tmsstart, tmsend;
    clock_t start,  end;
    int status;

    printf("\ncommand: %s\n", cmd);

    if ((start = times(&tmsstart)) == -1)
        err_sys("times error");

    if ((status = system(cmd)) < 0)
        err_sys("system() error");

    if ((end = times(&tmsend)) == -1)
        err_sys("times error");

    pr_times(end-start, &tmsstart, &tmsend);
    pr_exit(status);
}

static void pr_times(clock_t real, struct tms *tmsstart, struct tms *tmsend)
{
    static  long    clktck = 0;

    if (clktck == 0)
    {
        if ((clktck = sysconf(_SC_CLK_TCK)) < 0)
            err_sys("sysconf error");
    }

    printf(" real: %7.2f\n", real / (double)clktck);
    printf(" user: %7.2f\n", (tmsend->tms_utime - tmsstart->tms_utime) / (double) clktck);
    printf(" sys: %7.2f\n", (tmsend->tms_stime - tmsstart->tms_stime) / (double) clktck);
    printf(" child user: %7.2f\n", (tmsend->tms_cutime - tmsstart->tms_cutime) / (double) clktck);
    printf(" child sys: %7.2f\n", (tmsend->tms_cstime - tmsstart->tms_cstime) / (double) clktck);
}
